Solve algebra, geometry, statistics, and academic problems.
Full-function scientific calculator with trig, logs, powers, and memory functions.
Solve linear equations, quadratics, and systems of equations step by step.
Plot functions, find intersections, and visualize equations on a coordinate plane.
Calculate percentages, percentage change, and what percent one number is of another.
Find the percent increase or decrease between two values with step-by-step work.
Calculate square roots, cube roots, and nth roots with full decimal precision.
Raise any base to any power — positive, negative, or fractional exponents.
Simplify ratios, find equivalent ratios, and solve proportion problems.
Generate random numbers within any range — integers, decimals, or unique sets.
Add, subtract, multiply, and divide fractions with automatically simplified results.
Reduce any fraction to its simplest form with full step-by-step work shown.
Convert between Roman numerals and standard numbers in both directions instantly.
Solve for speed, distance, or time given any two values. Works in any units.
Calculate mean, variance, and standard deviation for any data set instantly.
Calculate p-values for z-tests, t-tests, and chi-square hypothesis tests.
Calculate confidence intervals for means and proportions. Includes sample size calculator.
From basic percentage calculations to advanced statistics and graphing, our 26 free math calculators cover the full range of problems students encounter from middle school through college. Every calculator shows step-by-step work so you can check your understanding, not just get an answer. Whether you need to simplify a fraction, solve a quadratic equation, or calculate a confidence interval for a statistics class, the tool is here and free.
Professionals use these tools too. The standard deviation calculator is used by analysts, researchers, and quality control engineers daily. The percentage change calculator is essential for anyone tracking metrics, sales figures, or test scores over time. The p-value calculator helps researchers evaluate statistical significance without needing dedicated software.
| Use Case | Best Calculator | Level |
|---|---|---|
| Check homework answers | Scientific Calculator | All levels |
| Solve for x | Algebra Calculator | Middle school and up |
| Visualize equations | Graphing Calculator | High school and up |
| Find missing triangle sides | Triangle Calculator | Geometry |
| Statistics coursework | Standard Deviation, P-Value, Confidence Interval | College |
| Track grades and GPA | GPA Calculator, Grade Calculator | High school and college |
Percentage calculations come up constantly outside the classroom. A 20 percent tip on a $47 dinner is $9.40. A product marked down 35 percent from $89.99 saves you $31.50. Your salary after a 4.5 percent raise goes from $52,000 to $54,340. The percentage calculator handles all three types: finding a percentage of a number, finding what percent one number is of another, and finding percentage change between two values.
The average tells you the center of a data set. Standard deviation tells you how spread out the values are. A class where everyone scored between 78 and 82 has a low standard deviation. A class where scores ranged from 45 to 98 has a high standard deviation even if the average is the same. Use standard deviation whenever you need to understand consistency, variability, or risk, not just the central tendency of a data set.